I am now 2 years, 4 months post left total hip arthroplasty, ceramic/ceramic. Have been back on the bike since 13 weeks post op. Initially, started on a wind trainer at 5 weeks. Still have some pulling/burning sensation in the L buttock, but notice no other problems riding, except age-related slowing(age 70). Live in north central AZ mountains so most of my rides are hilly. Use a compact double(48/34) crank on my road bike with a 12-27 cassette.
My THA resulted from a mtn. bike crash and resulting impacted hip fracture 9 years earlier, so I had a 1 cm. leg length discrepancy which has been corrected. Thus, I can actually ride better than I could preop. I notice no saddle-related problems. I primarily ride a custom Rivendell which allows me to get my handlebars slightly above the saddle level. I find this provides a more comfortable body position, although I am not on any 90 degree hip flexion restrictions.
If you have any other questions, feel free to contact me.